When a map is classically uniquely ergodic, it is expected that its quantization will posses quantum unique ergodicity. In this paper we give examples of Quantum Unique Ergodicity for the perturbed Kronecker map, and an upper bound for the rate of convergence.
In this paper we study the stochastic quantization problem on the two dimensional torus and establish ergodicity for the solutions. Furthermore, we prove a characterization of the $Φ^4_2$ quantum field on the torus in terms of its density under translation. We also deduce that the $Φ^4_2$ quantum field on the torus is an extreme point in the set of all $L$-symmetrizing measures, where $L$ is the corresponding generator.
We prove the ergodicity of the Wang--Swendsen--Kotecký (WSK) algorithm for the zero-temperature $q$-state Potts antiferromagnet on several classes of lattices on the torus. In particular, the WSK algorithm is ergodic for $q\ge 4$ on any quadrangulation of the torus of girth $\ge 4$. It is also ergodic for $q \ge 5$ (resp. $q \ge 3$) on any Eulerian triangulation of the torus such that one sublattice consists of degree-4 vertices while the other two sublattices induce a quadrangulation of girth $\ge 4$ (resp.~a bipartite quadrangulation) of the torus. These classes include many lattices of inte…
In this series, we investigate quantum ergodicity at small scales for linear hyperbolic maps of the torus ("cat maps'"). In Part II of the series, we construct quasimodes that are quantum ergodic but are not equidistributed at the logarithmical scales.
In this series, we investigate quantum ergodicity at small scales for linear hyperbolic maps of the torus ("cat maps"). In Part I of the series, we prove quantum ergodicity at various scales. Let $N=1/h$, in which $h$ is the Planck constant. First, for all integers $N\in\mathbb{N}$, we show quantum ergodicity at logarithmical scales $|\log h|^{-α}$ for some $α>0$. Second, we show quantum ergodicity at polynomial scales $h^α$ for some $α>0$, in two special cases: $N\in S(\mathbb{N})$ of a full density subset $S(\mathbb{N})$ of integers and Hecke eigenbasis for all integers.
From a dynamical viewpoint, basic phase transitions of statistical mechanics can be regarded as a breaking of ergodicity. While many random models exhibiting such transitions at the thermodynamics limit exist, finite-dimensional examples with deterministic dynamics on a chaotic attractor are rare, if at all existent. Here, the dynamics of a family of $N$ coupled expanding circle maps is investigated in a parameter regime where absolutely continuous invariant measures are known to exist. At first, empirical evidence is given of symmetry breaking of the ergodic components upon increase of the co…
Quantum Ergodicity for Point Scatterers on Arithmetic Tori
我们证明了一个类似的Shnirelman,Zelditch和Colin de Verdiere的量子遍历定理的情况下,没有潜在的经典遍历。我们考虑的系统是Laplacian与三角洲潜力的平方环面。有两种类型的波函数:旧的本征函数的拉普拉斯算子,这是不受散射体,和新的本征函数具有对数奇异性的散射体的位置。证明了新特征函数的全密度子序列在相空间中均匀分布。我们的估计是统一的耦合参数,特别是等分布举行的弱和强耦合量子化的点散射。
Motivated by a model presented by S. Gudder, we study a quantum generalization of Markov chains and discuss the relation between these maps and open quantum random walks, a class of quantum channels described by S. Attal et al. We consider processes which are nonhomogeneous in time, i.e., at each time step, a possibly distinct evolution kernel. Inspired by a spectral technique described by L. Saloff-Coste and J. Zúñiga, we define a notion of ergodicity for nonhomogeneous quantum Markov chains and describe a criterion for ergodicity of such objects in terms of singular values. As a consequence …
Harmonic band theory: rigidity of non-zero degree harmonic maps from 2-torus to complex projective space
Osaka Metropolitan University(大阪公立大学);Instituto Superior Técnico, Universidade de Lisboa(里斯本大学高等技术学院);Advanced Institute for Materials Research (WPI-AIMR), Tohoku University(东北大学物质材料研究高层研究所(WPI-AIMR))
The adiabatic limit of wave map flow on a two torus
研究了Lorentzian域R x Sigma上的两球值波映射流,其中Sigma是任意平坦的两环面。在小初速度的限制下,考虑了初值与全纯映射Sigma -> S^2的模空间相切的Cauchy问题.证明了在此极限下,波映射在全纯映射的模空间中关于L^2度量在精确意义下收敛到测地线。这建立了,在一个严格的设置,一个长期存在的非正式猜想沃德。